Looper mechanism for sewing-machines.



E. ER-ICKS ONI I LOOPER MECHANISM FOR SEWING MACHINES. APPLICATION FILEDIULY 3. I9IGI 1,243,147, Patented Oct. 16,1917.

ZSHEETS-SHEET 1.

lmwmmr: Edwardlfridssan,

E. ERICKSON.

LOOPER MECHANISM FOR SEWING MACHINES. APPLICATION FILED JULY 3.1916.

1 ,2413, 147. v Patented 0st. 16, 1917.

2 -SHEETSSHEET 2.

1? mama Edward Era'cksam,

, UNITED sirarss PATENTQFFKQE.

EDWARD ERICKSON', OF' CLIFTONDALE, MASSACHUSETTS, ASSIGNOR T0 .VIGTORSHOE MACHINERY-COMPANY, OF LYNN, MASSACHUSETTS, A CORPORATION .OF MASSA-onusnr'rs.

LOOPER "MECHANISM FOR SEwlNG MAcl-ilNEs.

Application filed July 3, 1916. Seria1N0.'107,867.

ToaZZ whom it may concern Be it known that I, EDWARD EnIoKsoN, a citizenof the United States of America, and a resident of Cliftondale,zin thecounty of Essex: and Commonwealth of Massachusetts, have inventedcertain new and useful Improvements in Looper Mechanisms forSewing-Machines, of which the following is a specification.

This invention relates-to looper mechanisms for lock-stitch sewingmachines, and has for its object the production Oflit device of thischaracter which is particularly adapted to be operated at high rates ofspeed.

'The invention consists primarily .in a looper mounted in asuitablesupport and provided with an eye ofiset from the shank thereof, saidlooper being provided with actuating means whereby said looper-may beoscillated about the axis of said shank, and said support being alsoprovided with means for oscillating said support about a pivot on whichit is mounted.

The invention further consists inhoscillating said looper and itssupport by cam mechanisms so timed that the eye of the looper will bemoved in a curved path around a loop hook in one direction and thenaround the needle in the opposite direction.

The invention furtherconsists in'providing means for temporarilystopping the movement of the looper eye while the needle is movingupward with the loop and then returning the eye with increased speed toits normal position.

'The invention consists further in-certain novel features ofconstruction and arrangement of parts which will be fully understood byreference to'the description of the drawings and to the claimshereinafter given.

'For'the purpose of illustrating theinvention. one preferred formthereof isillustrated in the drawings, this form having been found togive satisfactory andreliable results, although it is to be understoodthat the various 'instrumentalities of whichlthe invention consists canbe variously 2 arrangedand organized and that the invention is'notlimited to the precisezarrangement and organization of theseinstrumentalities as herein shown; and described.

Of the drawings:

Figure l'represents a sectionof a portion of a sewing machine havingapplied thereto a looper mechanism embodying the principles of thepresent invention, the needle being shown in raised position. I

Fig.2 represents a frontelevation of the same. i

Specification of Iletters Patent. Pgflgmmiged Get. 16, 1917. I

Fig. 3 represents a horizontal section of the same on line 33 011Fig. 1. i 1 'lTig. 4 represents a partial section similar to Fig. 1 withthe needle in its lowest position.

Fig. 5 represents a sectional detail of the universal connection at oneendof thelooper actuating link.

' Fig. 6 represents sectional detail of'the looper and its connectionwith the opposite end of its actuating link.

Figs. 7 to 10 inclusive represent diagrams showing the various positionsof the looper eye in relation to the presse-r foot, the loop hook, andtheneedle.

Fig. 11 represents a similar diagram showing the position of the' threadwhen laidin the barb of the needleand before the looper eye has moved toits normal'position, and f Fig. 12 represents a detailof the front ofthe needle.

Similar characters designate like parts throughout the several figuresof the drawlngs.

In the drawings, 10 is. a portion of the frame of a sewing machinehaving a hub 11 formed thereon through which extends a revolubleshaft12. This shaft 12 has'keyed thereto the cam disks 13 and 14. The :frame10 is also provided with a fixed stud 15011 which is mounted theoscillating member 16 carrying a barbed needle 17, said needle havingits hooked portion 18 on one side of said needle, as shown in Fig. 12 ofthe drawings.

Pivotedat 18 tothe member 16 is a link 19 through which oscillatorymovement may be imparted tothe member .16 from anysuitable sourceof-power. The member 16 has alsosecured thereto a' loop hook 20. Theframe- 1O alsohas secured theretoaxwork support 21 having a' slot 22 ina horizontal portion thereof.

The frame 10 is also provided with a headed stud 23 on which ispivotally mounted a tubular member 24. In the tubular member 24 ismounted a cylindrical shank 25 of a looper 26 having an eye 27 offsetfrom the axis of said shank 25.

The member 24 has pivotally connected therewith at 28 one end of a link29, the opposite end of which is pivotally connected to a lever 30pivoted at 31 to said frame 10. The lever 30 carries a roll 32 moving ina, cam path 33 in one face of the disk 14. As the disk: 14 revolves inthe direction of the arrow a, the lever 30 is moved about its pivot 31and transmits movement through the link 29 to the member 24 and causesit to be oscillated about the horizontal pivot member 23. The lower endof the shank 25 of the looper 26has clamped thereto the member34 havingan arm 35 extending latorally therefrom to which a link 36 is pivoted.37. The opposite end. of said link 36 is connected to a rod 38 by meansof the pivot pin39 perpendicular to the pivot pin 37. This makes auniversal connection between the rod 38 and the arm 35. The oppositeendof the rod 38 is threaded as at 40 to a nut 41 carried by a member42.

Thethreaded portion 40 of the rod 38 has also mounted thereon the nuts43 by a member 45 having a pivot pin 46 extending therethrough and intothe arms 44. The sleeve 41 is adapted to revolve in the mem ber 42'about the axis of the connecting rod 38, and the member 45 is adapted tomove about the axis of the pivot member 46, said axis beingperpendicular to the axis of the rod 38, thus forming a universalconnection between the rod 38 and the member 45. At 47 the member 45 ispivotally connected to the upper end of a lever 48, pivoted at 49 andhaving a roller 50 thereon adapted to move in the path 51 of the camdisk 13. As the cam disk 13 rotates about the axis of the shaft 12 inthe direction of the arrow 64 on Fig. 1 of the drawings, an oscillatingmovement is imparted to the lever 40 and this oscillatory movement isimparted to the rod 38 and the arm '35, and thereby causes the loopermember 26 to be oscillated about the axis of its shank 25.

As the shaft 12 revolves the two disks 13 and 14 will impart movementsimultaneously to the levers 30 and 48, and these movements will betransmitted through the connecting rods "29 and 38 to the tubular sleeve24 and the laterally extending arm 35, thereby causing an oscillation ofthe looper member 26,

and at the same time an oscillation of the tubular member supportingsaid looper. These two combined oscillations cause the eye 27 of thelooper 26 to move in a curved path fromits normal .position as indicatedin dotted lines in Fig. 7 intotheposition indicated in full lines inFig; 8 of the draw lngs, thls movement passing around the loop 27 willbe moved in a straight path with. in-

creased speed from the point shown in full lines in Fig. 9 to the pointshown in dotted lines in Fig. 10. g

This movement of the eye inlthe path shown in dotted lines in Figs. 8,9, and 10 of the drawings causes the thread if to be drawn around thelooper hook and then around the needle 17 in position to be seized bythe hook 18 of the needle as it is raised, as shown in Fig. 11 of thedrawings.

The cam paths 33 and 51 are so constructed that the necessary throwshave such time relationship to each other as to cause the eye 27 of thelooper to move in the curved path'indicated in Figs. 7 to 10 of thedrawings. The throws of the paths 33 and 51 provide forthe eye 27 of thelooper coming temporarily to a standstill in the position indicated inFig. 9 of the drawings until the needle has moved upwardly suiiicientlythe'memberv 34 to said shank. To accommodate this variation in theposition of the member 34 about the shank 25 ofthe looper 26, theconnecting rod 38 may be shortened or lengthened as desired by adjustingthe nut 41 on the thread end 40 of said connecting rod.

Both of the connecting rods 29 and 38 are on one side of the frame 10,whilethe cam 13 and the lever 48 are on the oppositeside of said frame,as shown in Fig. 3 of the drawings. In order, therefore, to providemeans whereby the member 45 maybe connected'to the lever 48, an opening53 is formed in the frame 10, as shown in dotted lines in Figs. 1 and 3of the drawings.

This makes a very efiective looper operating mechanism, which runs very.smoothly and without noise, and is particularly adapted for use onsewing machines run at a high rate of speed. 1'

It is believed that the operation and many advantages of this inventionwill be fully understood from the foregoing description.

Having thus described my invention, I claim: 7

1. In a device of the class described, .a hookedneedle; a looper havinga rotatable shank and an eye with-its axis slightly olfset from andparallel to the axis of said shank; means for imparting two distinctoscillatory movements to said looper, one of said movements being aboutthe axis of said shank and the other movement being:

about an axis perpendicular to the axis of .said shank; and means forpreventing end movement of said shank.

2. In a device of the classdescribed, a hooked needle; a looper having arotatable shank and an eye with its axis slightly offset from andparallel to theaxis of said shank; means for simultaneously impartingtwo distinct oscillatory movements to said looper, oneofsaldmovements'bem'g about the axis of said shank and the other movementbeing about an axis perpendicular. to.

the axis of said shank; and. means for preventing end movement of saidshank.

3. In device of the class described, a hooked needle; a looper having ashank rotatable about its axis and provided with an eye the axis ofwhich is substantially parallel to the axis ofsaid shank and offsettherefrom; means. for oscillating said shank about a horizontal axis;and independent means for positively oscillating said looper about theaxis of said shank.

4c- In a device of the class described, a hooked needle; a looper havinga shank rotatable about its axis and provided with an eye the axis ofwhich is substantially parallel to the axis of said shank and ofisettherefrom; a cam for oscillating said shank about a horizontal axis; andanother cam for positively oscillating said looper. about the, axis ofsaid shank.

5. In a device of the class described, a

hooked needle; a looper having a shank rotatable about its axis andprovided with an eye the axis of which is substantially parallel to theaxis of said shank and ofiset therefrom; means for oscillating saidshank about a horizontal axis; a laterally extending arm secured to saidshank; a cam operated lever; and a link between said lever and arm.

6. In a device of the class described, a hooked needle; a looper havinga shank rotatable about its axis and provided with an eye the axis ofwhich is substantially parallel to the axis of said shank and offsettherefrom; means for oscillating said shank about a horizontal axis; alaterally extending arm secured. to said'shank; a cam operated lever; alink oneend of which is connected to said lever; and a universalconnection between the opposite end of said link and said arm.

7. In a device of the class described, a hooked needle; a work-support;a pivoted looper support. inclined upwardly beneath said work support; alooper supported there by and provided at its upper end with an eye theaxis of Which is offset from and substantially parallel to the axis ofsaid shank; means for oscillatingthe shankv about its axis;a camcontrolled lever;; and a link connecting said lever' and. said loopersupport.

8'; In. a

looper support inclined upwardly beneath said work support; a pivottherefor; a

looper having .a cylindricalshank extending through said tubularsupport/and provided at its upper end with an eye the axis of which isoffset from and substantially parallel to the axis of said shank;'meansfcr oscillatlng the shank about 1ts ax s; a cam controlled lever;and a link connecting said;

lever and said looper support.

9. In a device of the class described, a hooked needle; a tubular loopersupport; a pivot therefor; a looper having a cylindrical shank extendingthrough said tubularsupport and provided with an'ieye ofis'etfrom theshank thereof; means for oscillating said looper about theaxis of saidshank; a 'cain' controlled lever; 5 aj; link connecting said lever andlooper support; an arm secureclt'o said shank; ,cam mechanlsm; andactuatlng substantially parallel to the axis'of said tubular support;means pivotally connected to said support adapted to oscillate it aboutits pivot; and means for oscillating the shank of said looper about itsaxis.

11. In a device of the class described, a hooked needle; a loopersupport; a pivot therefor; a looper mounted on said support and havingan eye the axis of which is substantially parallel to said support andofiset therefrom; means pivotally connected to said support adapted tooscillate it about its pivot; and means for oscillating the shank ofsaid looper about its axis.

12. In a device of the class described, a hooked needle; a loopersupport; a pivot therefor;.a looper mounted on said support 7 device ofthe class described, a hooked needle; a work support; a tubular Istantially parallel to'said support and offset therefrom; andcam-controlled mechanism for simultaneously and positively oscillatingsaid support about its pivot and said'looper about the aXis of itsshank.

13. In a device of the class described, a hooked needle; anosoillatingcarrier therefor; a depending hook thereon; a looper having a threadeye; and means for moving said looper eye from its normal positionaround said hook, betweensaid hook and needle, and then around saidneedle to its normal position.

14:. Ina device of the class described, a hooked needle an oscillatingcarrier therefor; a depending hook thereon; a looper having a threadeye; and means for moving straight path to its normal position; and

means for retaining said eye temporarily at said right point during theupward movement of the needle. 7 v

16. In a device of the class described, a hooked needle; an oscillatingcarrier therefor; a depending hook thereon; a looper having a thread eyemeans for moving said looper eye in a curved path around said hook, thenbetween said hook and needle, and then around said needle to a point atthe right thereof, temporarily stopping said eye at saidright point, andthen moving said eye in a straight path'irom said point to its normalposition.

' I 17. In a device of the class described, a'

hooked needle; an oscillating'carrier therefor; a depending "hookthereon; a looper having a thread eye; means for moving said loopereyein a curved path around said hook, then between said hook and needle,and then around said needle to a'point at the right thereof, temporarilystopping said eye at said right point, and then moving said eye withincreased speed in a straight path "from said point to its normalposition;

18.In a device of the class described, a

hooked needle; a looper pro'vided'wit-h an eye the axis of which isoffset from but substantially parallel to the axis of the shank thereof;means for oscillating said looper about a horizontal axis; a laterallyextend ing arm secured to'said shank; acam operat'ed lever; a linkbetween said lever and arm; and means for. varying the length'of saidlink. j

19; In a-devlce of the class descr1bed,a

hooked needle; a looper provided with an eye; a-carr1er'for said needle;a depend mg. hook' on said carrier; and cam m'echa-' nisms for actuatingsaid looper so timed relatively to each other that said eye will-bemoved from its normal position around said hook in one direction and inthe opposite direction around said needle. r

20. In a device of the-class described, a hooked needle; a looperprovided with an eye; a carrier for said needle; a depending hook onsaid carrier; and cam-mechanisms for actuatlng said looperso tlmedrelatively to each other that said eye will be moved from its normalposition around said hook in onedirection and in the opposite directionaround said needle, and will be moved with increased speed from a point"atthe right ot said needle to its normal position.

Signed by meat a PostOflice Sq., Boston,-

Mass .,this 8th day of June, 1916; Y 7

. EDWVA R'D ERICKSON.

, Witnesses: 7 1

IVALTER E. LOMBARD, NATHAN C. LoMBARD.

Copies of this patent may be obtained forfive cents each, byeuidressingtheCommissioner of -Patents,

' Washington, D. G.

